diff --git a/llvm/test/tools/llvm-objdump/X86/source-interleave-prefix-non-windows.test b/llvm/test/tools/llvm-objdump/X86/source-interleave-prefix-non-windows.test
--- a/llvm/test/tools/llvm-objdump/X86/source-interleave-prefix-non-windows.test
+++ b/llvm/test/tools/llvm-objdump/X86/source-interleave-prefix-non-windows.test
@@ -1,10 +1,11 @@
 ;; Test --prefix option platform specific behavior.
 ; UNSUPPORTED: system-windows
 
-;; Test removal of trailing separators (only '/').
+;; Test removal of trailing separators (only '/' on non-Windows systems).
 ;; The prefix 'myprefix/\' is not changed.
 
 ; RUN: sed -e "s,SRC_COMPDIR,/Inputs,g" %p/Inputs/source-interleave.ll > %t.ll
 ; RUN: llc -o %t.o -filetype=obj -mtriple=x86_64-pc-linux %t.ll
 ; RUN: llvm-objdump --prefix 'myprefix/\' --source %t.o 2>&1 | FileCheck %s -DFILE=%t.o -DPREFIX='myprefix/\'
 ; CHECK: warning: '[[FILE]]': failed to find source [[PREFIX]]/Inputs/source-interleave-x86_64.c
+
diff --git a/llvm/test/tools/llvm-objdump/X86/source-interleave-prefix-non-windows.test b/llvm/test/tools/llvm-objdump/X86/source-interleave-prefix-windows.test
copy from llvm/test/tools/llvm-objdump/X86/source-interleave-prefix-non-windows.test
copy to llvm/test/tools/llvm-objdump/X86/source-interleave-prefix-windows.test
--- a/llvm/test/tools/llvm-objdump/X86/source-interleave-prefix-non-windows.test
+++ b/llvm/test/tools/llvm-objdump/X86/source-interleave-prefix-windows.test
@@ -1,10 +1,11 @@
 ;; Test --prefix option platform specific behavior.
-; UNSUPPORTED: system-windows
+; REQUIRES: system-windows
 
-;; Test removal of trailing separators (only '/').
-;; The prefix 'myprefix/\' is not changed.
+;; Test removal of trailing separators (both '/' and '\' on Windows systems).
+;; The prefix 'myprefix/\' is changed to 'myprefix'.
 
 ; RUN: sed -e "s,SRC_COMPDIR,/Inputs,g" %p/Inputs/source-interleave.ll > %t.ll
 ; RUN: llc -o %t.o -filetype=obj -mtriple=x86_64-pc-linux %t.ll
-; RUN: llvm-objdump --prefix 'myprefix/\' --source %t.o 2>&1 | FileCheck %s -DFILE=%t.o -DPREFIX='myprefix/\'
-; CHECK: warning: '[[FILE]]': failed to find source [[PREFIX]]/Inputs/source-interleave-x86_64.c
+; RUN: llvm-objdump --prefix 'myprefix/\' --source %t.o 2>&1 | FileCheck %s -DFILE=%t.o -DPREFIX='myprefix'
+; CHECK: warning: '[[FILE]]': failed to find source [[PREFIX]]/Inputs\source-interleave-x86_64.c
+
diff --git a/llvm/test/tools/llvm-objdump/X86/source-interleave-prefix.test b/llvm/test/tools/llvm-objdump/X86/source-interleave-prefix.test
--- a/llvm/test/tools/llvm-objdump/X86/source-interleave-prefix.test
+++ b/llvm/test/tools/llvm-objdump/X86/source-interleave-prefix.test
@@ -1,13 +1,19 @@
 ;; Test --prefix option.
-;; UNSUPPORTED: system-windows
+
+;; Separators change from platform to platform. In POSIX the full path for the
+;; directory './Inputs' appended with the file 'source-interleave-x86_64.c' is
+;; './Inputs/source-interleave-x86_64.c'. For Windows it is
+;; './Inputs\source-interleave-x86_64.c'. Platform specific tests are needed
+;; since '\' may or may not be a separator.
 
 ;; Test prefix option ignored for relative paths.
+;; For the test below it is possible to accept both '/' and '\' as a separator.
 
 ; RUN: sed -e "s,SRC_COMPDIR,./Inputs,g" %p/Inputs/source-interleave.ll > %t-relative-path.ll
 ; RUN: llc -o %t-relative-path.o -filetype=obj -mtriple=x86_64-pc-linux %t-relative-path.ll
 ; RUN: llvm-objdump --prefix myprefix --source %t-relative-path.o 2>&1 | \
 ; RUN:   FileCheck %s --check-prefix=CHECK-BROKEN-PREFIX -DFILE=%t-relative-path.o -DPREFIX=.
-; CHECK-BROKEN-PREFIX: warning: '[[FILE]]': failed to find source [[PREFIX]]/Inputs/source-interleave-x86_64.c
+; CHECK-BROKEN-PREFIX: warning: '[[FILE]]': failed to find source [[PREFIX]]/Inputs{{[/\\]}}source-interleave-x86_64.c
 
 ;; Test invalid source interleave fixed by adding the correct prefix.
 
@@ -34,3 +40,4 @@
 
 ; RUN: llvm-objdump --prefix myprefix// --source %t-missing-prefix.o 2>&1 | \
 ; RUN:   FileCheck %s --check-prefix=CHECK-BROKEN-PREFIX -DFILE=%t-missing-prefix.o -DPREFIX=myprefix
+